Ingot mold stool



Allg- 2, 1938- c. R. FON DERSMITH ET A1. 2,125,496

INGOT MOLD STOOL Filed April 29, 1937 Patented Aug. 2, 1938r UNITEDSTATES PATENT OFFICE.

. mann, Middletown,

Ohio, ,'assignors to The American Rolling Mill Company, Middletown,Ohio, a corporation of Ohio Application April 29, 1937, Serial No.139,670

5 Claims.

This invention relates to ingot mold stools. In

rolling mill practice, hot steel Afrom the ladle is poured into molds toform ingots suitable for placing in the soaking pits and subsequentrolling on a blooming mill. The mold into which the steel is poured isreferred to as an ingot mold and must be so designed that the chilledsteel may be extracted from the mold. Usually this is done by making themold in two pieces. 'I'he four sides of the mold form one piece which isusually tapered to facilitate removal of the chilled ingot and a moldstool usually forms the bottom of the mold. In practice themember-composing the four sides is placed upon the mold stool and themetal is poured into the mold. Subsequently the ingot is rammed outthrough the larger end of the mold. l

Mold stools for the purpose above described are not new, but they havealways been open to several objections. It is difficult to make the moldstool of a, material which will stand up Cil under the impact due to thestream of metal impingingon the bottom during pouring of the ingot, andthen stand up under the subsequent heating due to contact with themolten steel. Furthermore, the sticking of the ingot to the stool hasbeen a troublesome element which has impeded the removal of the ingotfrom the mold.

In View of the above mentioned factors, it is an D object of ourinvention to provide a mold stool which will be of adequate strength tosupport a steel ingot and which will stand up under the rapid heating upon account of the contact with molten metal. Further objects of ourinvention 5 include the provision of a mold stool which will be light inweight and which will have an aircooled bottom, whereby sticking of theingot to the stool is practically eliminated, whereby the vlife of thestool is greatly increased, and whereby the cost of the stool for metaland freight will be materially reduced.

These and other objects of our invention which will be pointedhereinafter, or which will be apr parent to one skilled in the art uponreading 5 these specifications, we accomplish by that certainconstruction and arrangement of parts of which we shall now describe anexemplary embodiment. Reference is now made to the drawing which forms apart hereof and in which: i Figure 1 is a top plan View of a mold stoolaccording to our invention.

Fig. 2 is an end elevation of the same. Fig. 3 is a side elevation ofthe same. Fig. 4 is a cross sectional view of thesame i taken on theline 4-4 of Fig. 1.

Fig. 5 is a cross sectional view showing how the mold stool according toour invention rests on the car and showing the air currents which areset up for cooling the mold stool bottom.

Fig. 6 is a bottom plan view of the mold stool.

Briefly in the practice 'of our invention, we provide a mold stoolcomprising a flat surface which is adapted to form the bottom of theingot mold. We form the bottom of the stool in such a manner that anadequate supporting surface is provided and at the same time,Ventilating passages are provided so that when the mold stool, with themold and ingot upon it, is resting on the mold car, convection aircurrents will be set up to cool the bottom of the mold, whereby its lifeis increased and sticking is reduced.

'I'he mold stool comprises a single piece of metal having a at surfacel, which forms the bottom' of the mold. The stool is preferably roundedat the corners and is provided with the tion in Fig. 4, is shaped likean inverted truncated isosceles triangle having the sloping sides 1 and8 which merge into the bottom of the surface l. The longitudinal ribs 3,4 and 5 are beveled as indicated at 3a, 4a and 5a respectively, in orderto eliminate mass. This beveling, of course, does not reduce thestrength of the stool, but merely reduces the weight of the stool. Alongits longitudinal edges the stool is provided with the buttress members 9and I0 which serve as spacers when a number of such mold stools areplaced side by side on a mold car. It will be noted that the rib 6projects downwardly below the lower 4edges of the longitudinal ribs 3, 4

and 5. At each end of the rib 6 we have provided the elements 6a whichextend to 'the same depth as. the bottomof the rib 6 and which extendlongitudinally a substantial distance. These members serve to locate themold stools on the mold car, as will be described hereinafter. As willbe noted from Fig. 6 the various planes and angles are nicely roundedWhere they meet other planes and angles so as to present a smooth andfinished appearance. By reference to Fig. 4 it will be noted thatpassages Il are thus provided between the longitudinal ribs 3 and 4 andbetween the longitudinal ribs 4 and 5 toward each side of the centraltransverse rib 6.

In use the mold stool is placed upon` a mold car as shown Fig. 5. Thecar is provided with wheels I2 riding on tracks I3 and is provided withthe j longitudinal structural members I4. The members I4 lare spaced sothat their inner :vertical portions will receive the downwardlyprojecting longitudinal elements 6a between them. In this way the moldstoos will rst upon'the mold car without danger of slipping off the cartoward one side or Ythe other. Thefarrows I5 in Fig. 5 indicate thecourse of air currents from the opr of the :mill'up through the' moldcar and out onfeach side under the mold stool. Because of th extremeheat around the outside of the jingot molds, these up currents .of airare produced in a inanner'analogous to the stackeiect caused by thediierent densities or? the airin the immediate vicinity of the mold ascompared to the air further away. Thus an easy passage has been providedfor the convection currents described, by the continuous air currentspassing up through the car and around the bottom of the mold stool asindicated at I5. The stool-is continuously cooled, whereby its life isgreatly increased and we have found that sticking of the ingot to themold stoollis practically eliminated.

It is to be understood, or course, that modifications may be mariewithout departing from the spirit of our invention and that We do notintend to limit ourselves other than as pointed out 'in the claims whichfollow. Having now fully described our invention, what we claim as newand desire to secureby Letters Patent is: 1

f 1. An ingot mold stool for usewith open-endl ingot molds, said stoolcomprising-a unitary casting having a relatively thin portion-formingthe bottom of the mold, andrstrengthening ribs inte- Y standing on aningot mold car.

.Y 2. An ingot mold stool for use with open-end molds, saidstoolcomprising a yunitary casting laving a relatively thin portion formingthe bottom of the mold, a plurality of longitudinal strengthening ribsintegral therewith on the underside, and a central transversestrengthening rib integral therewith, whereby -tWo sets of coolingchannels are provided on the underside of said 4. Incombination, aningot mold stool and af car, said car having spaced supporting surfaces22 for said stool, said stool having supporting elements adapted to seaton said supporting suri faces, and Ventilating vchannels formed on theun derside thereof, whereby air currents may pass from the floor upthrough the car and out "through said channels and means on the sides ofsaid stool to provide for the .spacing of other stools resting on saidcar.

5. In combination, a car having a pair of spaced supporting surfaces,and a plurality of mold stools thereon, said mold stools havingsupporting elements on their undersides adapted to seat on saidsupporting surfaces, means cooperatingV with said spacedsupportingsurfaces to prevent said stools from sliding off said car, means on thesides of said stools to space them apart, and Ventilating channelsformed onY the undersides thereof, whereby air currents may pass fromthe floor up. through the car and out through said channels. v

CHARLES R. FON DERSMITH. WILLIAM W. BERG

